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Openings formed by setting the parapets out on corbels so as to project beyond the face of the wall. Some parapets set out on corbels have a similar appearance, even if there are no openings.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
An overhanging defensive structure at the top of a medieval fortification, with floor openings through which boiling water or oil, missiles, etc., could be dropped on attackers.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.